Back in the 14th century, a plague broke out that ended up decimating the entire continent of Europe so much so that it continues to be one of the deadliest diseases to ever come about at this current point in time. This disease was called the Black Plague, and it is just one of the many illnesses that rats can host inside of their bodies. Rats are notorious for carrying diseases that don’t really harm them all that much, but suffice it to say that if you are exposed to anything that is within their biological makeup the best case scenario is that you would suffer tremendously and the worst case is that you would cease to live without a shadow of a doubt.
As a result of the fact that this is the case, seeing even a single rat at home is something that you should take very seriously indeed. The key to mice, rats & rodents removal is to realize that rats are basically foragers. They have large colonies that are relatively advanced in terms of social segregation and the like, and only the biggest rats go out looking for food.
If you were to place a rat trap that has a bit of food on it, chances are that these scavengers wouldn’t be able to resist giving it a nibble. When they approach the food, the rat will immediately snap shut and kill them. Since these are the foragers that bring food for the rest of the colony, all of the other members of its tribe will die out eventually as well although it will be a good long while before this happens if you don’t hire an expert.